Query param update during loading does nothing

index.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  queryParams: ['test'],
  test: "NOT SET YET",
});

index.route.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return new Ember.RSVP.Promise(function (resolve) {
      setTimeout(() => resolve(), 2000);
    });
  },
  
  actions: {
    loading() {
      console.log("QUERY PARAM AT LOADING TIME: " + this.controllerFor('index').test);
      return false;
    },
    didTransition() {
      console.log("QUERY PARAM AFTER MODEL RETURNED: " + this.controllerFor('index').test);
    }
  }
});

index.template.hbs

Hit the following URL, and open console logs

/?test=VALUE

loading.template.hbs

CHECK CONSOLE LOGS

router.js

import Ember from 'ember';
import config from './config/environment';

var Router = Ember.Router.extend({
  location: config.locationType
});

Router.map(function() {
  this.route('index', {path: '/'}, function() {
  });
});

export default Router;

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.1.0",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "2.1.0"
  }
}